Oracle-L: RE: Unable to connect to an Oracle Instance

From: kkennedy <kkennedy_at_firstpoint.com>
Date: Wed, 03 Jul 2002 10:18:31 -0800
Message-ID: <F001.0048F289.20020703101831@fatcity.com>

Can you ping the host?

When I have a connectivity problem, I follow a set procedure that saves lots of time in the long run.

ping host
tnsping sid
sqlplus user/name_at_sid
wing it (i.e. ODBC problem or other client program that won't connect).

If step 1 fails, you can try pinging using the IP address also. I usually look for help from the network folk at this point.

If step 1 succeeds and step 2 fails, I start investigating my tnsnames.ora file and the status of the listener on the server.

If steps 1&2 succeed and step 3 fails, it is time to make sure the database is up and the user is valid. It is rare that the diagnosis actually gets this far.

Step 4 is the catchall. Very rare, except during ODBC setup. I think I've dealt with this once or twice and I'm sure it was a different problem each time.

Kevin Kennedy
First Point Energy Corporation

-----Original Message-----
Sent: Wednesday, July 03, 2002 4:28 AM
To: Multiple recipients of list ORACLE-L

Hi,

I am not able to connect from my oracle client to an oracle db server (NT)

When i try to configure and test for the ora service(from my work station) it says "Connecting...ORA-12545: Connect failed because target host or object does not exist The test did not succeed.(this particular ora instance is not connectable from any workstation) "

Thanks in Advance

K.
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Author: kkennedy
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